linux-kernel - Re: [PATCH] hvc_dcc : add support to armv4 and armv5 core

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Message-ID: <20120831105901.GF18957@n2100.arm.linux.org.uk>
Date:	Fri, 31 Aug 2012 11:59:01 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Matthieu CASTET <matthieu.castet@...rot.com>,
	"arnd@...db.de" <arnd@...db.de>, "gregkh@...e.de" <gregkh@...e.de>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthieu CASTET <castet.matthieu@...e.fr>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] hvc_dcc : add support to armv4 and armv5 core

On Fri, Aug 31, 2012 at 11:59:39AM +0100, Alan Cox wrote:
> On Fri, 31 Aug 2012 11:33:51 +0100
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> 
> > On Fri, Aug 31, 2012 at 12:29:04PM +0200, Matthieu CASTET wrote:
> > > Alan Cox a écrit :
> > > > On Fri, 31 Aug 2012 11:21:56 +0200
> > > > Matthieu CASTET <castet.matthieu@...e.fr> wrote:
> > > > 
> > > >> Signed-off-by: Matthieu Castet <matthieu.castet@...rot.com>
> > > >> ---
> > > >>  drivers/tty/hvc/hvc_dcc.c |   34 ++++++++++++++++++++++++++++++++++
> > > >>  1 file changed, 34 insertions(+)
> > > > 
> > > > This is a step in the wrong direction. This should all be runtime handled
> > > > 
> > > > NAK.
> > > > 
> > > 
> > > AFAIK you can't build a arm kernel that support arm6/armv7 and armv5.
> > > And I am not sure it will be possible one day.
> > 
> > There are no plans to ever make it possible; there are too many significant
> > differences between ARMv4, v5 architectures and ARMv6,v7 architectures
> > to warrant making this runtime selectable.
> 
> Then bury this crap in platform files please not in the drivers/tty layer
> code. Make it a platform driver provided callback or something.

Platform driver callbacks via platform data are incompatible with DT,
which is where folk elsewhere in the kernel community have kicked ARM
towards, away from the platform driver/device with platform data model.
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